Flying from Chengdu to Hong Kong is considered an international or regional flight because Hong Kong is a Special Administrative Region (SAR) with its own immigration, customs, and border controls separate from mainland China. Travelers departing from Chengdu must go through international exit procedures at either Chengdu Tianfu International Airport (TFU) or Chengdu Shuangliu International Airport (CTU) and pass through Hong Kong immigration upon arrival at Hong Kong International Airport (HKG). Direct flights are available daily through several airlines, including Air China, Cathay Pacific, Hong Kong Airlines, Sichuan Airlines, and Tibet Airlines, with an average nonstop flight time of approximately 2 hours and 30 minutes to 3 hours. Because it is treated as a cross-border journey, passengers are required to carry valid travel documents, such as a passport or a Mainland Travel Permit for Hong Kong and Macao Residents, depending on their nationality and residency status.